Question: Does this action support alerts on pull requests?

I've successfully configured this action and everything is running very nicely on the `main` branch. I'm keen to also run this action on pull requests and receive alerts when there are benchmark regressions.

I [updated my action config to run on PRs](https://github.com/ColinEberhardt/assemblyscript-regex/commit/482ee80448f428b36e2460dbe7c759a4e3ace485), however, it fails as follows:

~~~
0s
Run rhysd/github-action-benchmark@v1
with:
tool: benchmarkjs
output-file-path: benchmark/output.txt
comment-on-alert: true
alert-comment-cc-users: @colineberhardt
auto-push: true
name: Benchmark
gh-pages-branch: gh-pages
benchmark-data-dir-path: dev/bench
skip-fetch-gh-pages: false
comment-always: false
save-data-file: true
alert-threshold: 200%
fail-on-alert: false
Error: 'auto-push' is enabled but 'github-token' is not set. Please give API token to push GitHub pages branch to remote
~~~

/see https://github.com/ColinEberhardt/assemblyscript-regex/pull/21

Any ideas?